Sash pulley and mounting therefor



DEEU'CU flu-i) ii UNITED STATES PATENT OFFICE SASH PULLEY AND MOUNTING THEREFOR Earl C. Swanson, Bayport, Minn., assignor to Andersen Corporation, Bayport, Minn., a corporation of Minnesota Application April 24, 1942, Serial No. 440,318

1 Claim.

This invention relates to sash pulleys for vertically sliding windows and particularly to the construction of such pulleys and the manner of mounting the same upon the pulley stile or side jamb of the window frame.

Heretofore sash pulleys have been made of various metals and mounted in metallic casings which are secured to the side jamb or pulley stile by means of an escutcheon overlying the exposed surface of the jamb.

It is the object of my invention to reduce to a minimum the amount of metal used in window constructions and therefore I propose to make my sash pulleys of wood. The wood of the lignum vitae tree is ideal for this purpose because it is a hard dense wood that contains approximately thirty per cent of natural oil. Therefore, my pulleys may be said to be self-lubricating.

While I have mentioned lignum vitae as an ideal wood for my pulleys, my invention as hereinafter pointed out is not confined to the use of that wood. Other woods are also satisfactory such, for example, as maple, and such material will be highly useful for my purposes, especially if the wood be impregnated with wax or similar preserving and lubricating material.

Further, to reduce the weight of metal, I mount my wood pulley on an axle, preferably made of glass. The combination of a wood pulley on a glass axle makes an excellent construction in that friction between the pulley and its axle is reduced to a minimum, while at the same time I dispense with the use of the critical metals.

The use of glass axles is at the present time important because it dispenses with the use of steel which is now a critical material. It will be understood, however, that my wood pulleys may be equally satisfactory when mounted for rotation on steel axles or axles made of other metals or other materials.

In addition to the pulley and its axle, I also propose a new form of pulley housinj: or case. This also is made of wood and is mounted upon the back surface of the pulley stile c. jamb by means of securing elements which are not ViSr ible from the exposed surface of the jamb. Thus, I not only dispense with the use of metal for pulley cases but I produce a construction, which, from the standpoint of appearance, is more pleasing.

The drawing appended hereto illustrates a practical embodiment of my invention as the same may be applied to an ordinary double hung window which in all other respects is of standard construction. I do not intend to confine myself to the precise details of construction illus-- trated as modifications of the invention will readily occur to those skilled in the art and may be made without departing from the spirit or scope of the invention as defined in the appended claim.

In the drawing:

Fig. 1 is a fragmentary view partly in section and partly in elevation of the upper part of the frame of a double hung window embodying my invention;

Fig. 2 is a view in side elevation of the structure illustrated in Fig. 1;

Fig. 3 is a, view in vertical section taken substantially on line 33 of Fig. 1; and

Fig. 4 is a view in vertical section taken substantially on line 4-4 of Fig. 1.

As above stated, my invention may be applied to any ordinary sliding window which is a structure so common and well known that I deem it unnecessary to illustrate a complete window. It is entirely sufficlent for the understanding of my invention to illustrate the construction of the sash pulleys and the manner in which they are mounted because it is in those details that my invention resides.

Thus, in Fig. 1, I have illustrated merely the upper part of a double hung window frame in which the pulley stile or side jamb is indicated by the reference character 5, the head jamb by the reference character 6, the usual outside blind stop by the reference character I, and inside stop by the reference character 8. I also provide the usual parting stop 9 which seats in a groove extending longitudinally in the side jamb 5 and substantially centrally thereof.

Upon each side of the parting stop 9, I provide a pulley opening l0 through which project the pulleys presently to be described. These openings, as illustrated in Fig. 4, flare outwardly towards the back of the side jamb 5 so as to facilitate the threading of the sash cord which will also be presently described.

As indicated in Figs. 3 and 4, the back of the jamb 5 is provided with a recess I l which extends transversely of the jamb.

Upon the back of the jamb 5, I mount a pulley case l2 which is made of wood and which is provided with passageways 13 for the sash cord or chain. As illustrated particularly in Fig. 4, the passages I3 in the pulley case register with the pulley openings In in the jamb 5.

The pulley case I! is provided with a projecting part l4 extending transversely thereof and which, when the pulley case is in position, is seated in the recess ll formed in the lamb 5.

Suitable fastening elements, such as the screws l5, pass through the Jamb and into the body of the pulley case. These screws are located in the parting stop groove formed in the side jamb so that when the parting stop is in place the fastening screws for the pulley case are concealed from view. By this manner of mounting the pulley case on the jamb, that is to say, by the cooperating projection l4 and recess II, the load is taken from the screws I5 and placed on the side jamb 5.

The pulleys of my invention are indicated by the reference character I6. They may be used either with sash cords H, as shown, or with any form of sash chain. The pulleys [B are made of wood and, particularly, the wood of the lignum vitae tree. This is a very hard dense wood which is readily available in large quantities. It is particularly suitable for my purposes because it contains natural oils up to about thirty per cent and, therefore, the pulley is substantially self-lubricating. Maple and other hard woods are also suitable as the material for my pulleys and are especially satisfactory when impregnated with wax or similar preserving and lubricating material.

My pulleys are mounted rotatably on axles l8 which I prefer to make of glass. A heat-resisting glass, such as that commonly known under the trade-mark Pyrex is ideally suited for my purpose.

Because the glass axle presents a very smooth bearing surface, and because my wood pulleys contain a great deal of natural oil, this combination reduces friction to a minimum, thus assuring long life and easy rotation of the pulleys on their axles.

However, my invention as hereinafter defined is not dependent upon the material of which the axles are made. During present emergency conditions, I recommend and prefer the use of glass, thereby saving other critical materials. However, steel axles are eminently satisfactory for my purposes and may equally well be used so long as steel is available.

The said axle I8 is mounted partly in a recess [9 formed in the projecting part I4 of the pulley case [2 and partly in a shallow recess 20 formed in the wall of the recess H in the side jamb 5. By this arrangement the axle I8 is held securely because it is clamped between the pulley case and the jamb and this clamping action results when the screws l5 are tightly seated.

In my construction, as viewed from the exposed surface (Fig. 1), it will be seen that I have eliminated the usual escutcheon by, which pulley cases have heretofore been mounted on the pulley stiles, and I have also concealed any fastening means for my pulley case because the said fastening means are located in the parting stop groove and thus are covered by the parting stop.

I believe that my invention will now be readily understood by those skilled in the art. It will be seen that I have eliminated entirely the use of metal for sash pulleys and axles, as well as for the usual pulley case. I use wood and glass with resultant economy and yet I produce a structure which is as efficient as the metal constructions heretofore employed for this purpose. Where steel is available as the material for the axles, it may be employed with equal satisfaction, while the other parts are made of wood.

It will also be understood that the assembling of the pulleys on their axles, and of the pulley cases to the side jambs, is very much simpler in my construction than in the forms heretofore generally employed.

Thus, I have reduced considerably the weight of metal without sacrificing eficiency or durability.

I claim as my invention:

In a window construction, a side jamb having a parting stop groove in its front surface, a pulley case at the back of said jamb, and fastening means passing through said groove and into said case, whereby when a parting stop is inserted in said groove sai as emng m ns w be concealed from view.

EARL C. SWANSON. 

